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  1. #1
    Join Date
    Sep 2010
    Posts
    8

    Home Made Chiller with Trane 4TTZ060 Condensing Units

    Hi my name is Javier Borges I am from PR right now I am installing 20 Tons Chilled water system using 4 Trane 4TTZ060 condensing units and 2 10 tons plate HX. Right now I have trouble deciding which DDC Controls to use should I use Trane Controls (++++++++++ Expensive) or my trusted control supplier which supplies Trend Controls. For those of you that do not know these trane units have two compressors inside of them and requiere a special wiring harness to connect them to any control either Trane or Trend. Please reccommend thanks.


    20121011_104127.jpg

  2. #2
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,723
    Are these the kind of units that have a small compressor and a large compressor?

  3. #3
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Sounds like fun although I'm not familiar with either control systems you mention. Are these units 2 stages? Seems to me like you need something that will the number of stages in addition to a leaving water sensor, freezestat, and all that. How are you going to control the pump? What kind of application is this going to be used it?

  4. #4
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,438
    is it just me or do the txv external equalizer lines look like they are going to the wrong suction line?
    How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...

    1. Remove your meter leads from the meter and very carefully return them to their storage case or bag.
    2. Wait 2 seconds
    3. Very carefully remove your meter leads from their storage place and enjoy your new knot!

  5. #5
    Join Date
    Sep 2010
    Posts
    8
    I am using a DDC based control system because it gives me the best control of the system, and the fancoil units in the house. I already have done all things for protecting the system including: freezestat, dp switch (is more accurate than a flow switch), on/off control valves for HX when full load is not neccesarry, planning on putting high and low ref pressure sensors to communicate to the controler. These CU start using the big compressor and when the load is acheived the small compressor starts that is the way the units saves energy. The thing with the CU is that if you do it wrong the compressors start failing and after a couple of failures Tranes does not warranty them at least locally this is my main problem. Have known of this problem from an early experience from another contractor but the system was with a multiple cu units split system.

  6. #6
    Join Date
    Nov 2005
    Location
    Shreveport, Louisiana
    Posts
    2,329
    Did you decide who's DDC controls you will use????
    UA Local 141

  7. #7
    Join Date
    Sep 2010
    Posts
    8
    Will present Pros/cons to the owner and let them decide! Still waiting for the answer to my first question that was if it was you which controls company would you use? I am still waiting for some parts to arrive like pumps some control valves, chilled water insulation will be done too, etc

    Air handling side work is already done except grills and diffusers.

  8. #8
    Join Date
    Nov 2005
    Location
    Shreveport, Louisiana
    Posts
    2,329
    Quote Originally Posted by jborges View Post
    Will present Pros/cons to the owner and let them decide! Still waiting for the answer to my first question that was if it was you which controls company would you use? I am still waiting for some parts to arrive like pumps some control valves, chilled water insulation will be done too, etc

    Air handling side work is already done except grills and diffusers.

    Cannot answer that question correctly as I do not know anything about Trends products but you are the one with the final answer and sounds like some knowledge of Trends product
    UA Local 141

  9. #9
    Join Date
    Dec 2010
    Location
    Down by the river
    Posts
    1,664
    Quote Originally Posted by jayguy View Post
    is it just me or do the txv external equalizer lines look like they are going to the wrong suction line?
    Has that apearance.


    Pretty cool project though

  10. #10
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,723
    I'm pretty sure those circuits cross over in that BPHE.

    Quote Originally Posted by jayguy View Post
    is it just me or do the txv external equalizer lines look like they are going to the wrong suction line?

  11. #11
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    450
    Looks like a clean job.
    Who makes that pipe isolator for the uni-strut clamp?
    Have you thought of adding a liquid line solenoid valve to prevent migration. Does that condenser have a suction accumulation to prevent liquid slugging on start up or is it even necessary?

    As far as Trend goes they make a good control as long as you have the support.

  12. #12
    Join Date
    Sep 2010
    Posts
    8
    The units are the one that have the double compressor and they are going to be used on high end residence for chilled water. I have already consider a freezestat, and every other sensor in that need to be done. The pumps will be controlled with the same DDC controls that will be installed with DPS and Transmitter for bypass valve. This is my third system that I have built but never with these condensing units. The hx suction and liquid connections are crossed blow them with nitrogen before doing installation.


    Those isolators are electrical PVC Pipe cut at 3"

  13. #13
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,723
    I don't know your condensing unit's exactly but it my understanding that only one compressor runs at a time correct and not a true two stage?

    Quote Originally Posted by jborges View Post
    The units are the one that have the double compressor and they are going to be used on high end residence for chilled water. I have already consider a freezestat, and every other sensor in that need to be done. The pumps will be controlled with the same DDC controls that will be installed with DPS and Transmitter for bypass valve. This is my third system that I have built but never with these condensing units. The hx suction and liquid connections are crossed blow them with nitrogen before doing installation.


    Those isolators are electrical PVC Pipe cut at 3"

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